"Closer-to-home" strategy benefits juvenile survival in a long-distance migratory bird
"Closer-to-home" strategy benefits juvenile survival in a long-distance migratory bird
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DOI：
10.1002/ece3.5395
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发表时间：
2019-07-23
影响因子：
2.6
通讯作者：
Flack, Andrea
中科院分区：
文献类型：
--
作者：
Cheng, Yachang;Fiedler, Wolfgang;Flack, Andrea
人类引起的气候和环境以前所未有的速度发生变化正在挑战迁徙物种的存在。面对这些新的挑战，具有多样化和灵活迁徙行为的物种可能会较少受到种群数量下降的影响，因为它们可能通过改变迁徙行为更好地应对这些变化。在个体层面，迁徙行为的变化可能导致适应性差异，从而影响种群的人口动态。利用 169 只白鹳 (Ciconia ciconia) 的终生 GPS 生物记录数据，我们探讨了白鹳最近缩短的迁徙距离是否会影响它们在幼年不同阶段的生存。我们还探讨了迁徙决策（即时间、目的地）、运动活动（使用整体身体动态加速度测量）和早期生活条件的其他变化如何影响幼年生存。我们观察到，对于幼年白鹳来说，第一次秋季迁徙是最危险的时期。迁徙距离较短、羽翼较早的个体的死亡风险较低。此外，较高的运动活动和“离家较近”越冬（84.21％的被追踪个体留在欧洲或北非）与较高的生存率相关。我们的研究表明鸟类迁徙者如何在短短几十年内改变生活史决定，因此它有助于我们理解和预测迁徙者如何应对快速变化的世界。
Human-induced changes in the climate and environment that occur at an unprecedented speed are challenging the existence of migratory species. Faced with these new challenges, species with diverse and flexible migratory behaviors may suffer less from population decline, as they may be better at responding to these changes by altering their migratory behavior. At the individual level, variations in migratory behavior may lead to differences in fitness and subsequently influence the population's demographic dynamics. Using lifetime GPS bio-logging data from 169 white storks (Ciconia ciconia), we explore whether the recently shortened migration distance of storks affects their survival during different stages of their juvenile life. We also explore how other variations in migratory decisions (i.e., time, destination), movement activity (measured using overall body dynamic acceleration), and early life conditions influence juvenile survival. We observed that their first autumn migration was the riskiest period for juvenile white storks. Individuals that migrated shorter distances and fledged earlier experienced lower mortality risks. In addition, higher movement activity and overwintering "closer-to-home" (with 84.21% of the tracked individuals stayed Europe or North Africa) were associated with higher survival. Our study shows how avian migrants can change life history decisions over only a few decades, and thus it helps us to understand and predict how migrants respond to the rapidly changing world.